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  <title>Constructs a new doubly linked list</title>

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  <h1 class="refname">SplDoublyLinkedList::__construct</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.3.0)</p><p class="refpurpose"><span class="refname">SplDoublyLinkedList::__construct</span> &mdash; <span class="dc-title">Constructs a new doubly linked list</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-spldoublylinkedlist.construct-description">
  <h3 class="title">说明</h3>
  <div class="constructorsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>SplDoublyLinkedList::__construct()</strong></span>
    ( <span class="methodparam">void</span>
   )</div>

  <p class="para rdfs-comment">
   This constructs a new empty doubly linked list. 
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-spldoublylinkedlist.construct-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-spldoublylinkedlist.construct-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   没有返回值。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-spldoublylinkedlist.construct-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3703">
    <p><strong>Example #1 <span class="function"><strong>SplDoublyLinkedList::__construct()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$dll&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SplDoublyLinkedList</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$dll</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">push</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$dll</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">push</span><span style="color: #007700">(</span><span style="color: #0000BB">3</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$dll</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">unshift</span><span style="color: #007700">(</span><span style="color: #0000BB">5</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$dll</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
object(SplDoublyLinkedList)#1 (2) {
  [&quot;flags&quot;:&quot;SplDoublyLinkedList&quot;:private]=&gt;
  int(0)
  [&quot;dllist&quot;:&quot;SplDoublyLinkedList&quot;:private]=&gt;
  array(3) {
    [0]=&gt;
    int(5)
    [1]=&gt;
    int(2)
    [2]=&gt;
    int(3)
  }
}
</pre></div>
    </div>
   </div>
  </p>
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